never underestimate sheer force of will and vietnamese coffee

• small LTN fixes: don't filter one-way roads or mess up undo with the freehand tool, highlight the boundary road
• LTN style changes: traffic signals, don't show stop signs or crosswalks, get the center line color correct in the UK
• create a second Bristol LTN consultation mode, with a special overriden boundary
• initial support for modifying one-way streets in the LTN tool (with many limitations)